Narrowing searches based on url, author, date, and other attributes is also possible. For instance, the query [ Streisand sourcename:Techdirt ] restricts searches for "Streisand" to items from the blog "Techdirt".
Examples of other operators follow:

sourceurl:http://www.theverge.com/

items from the blog http://www.theverge.com/

sourcename:"New York"

items from blogs with "New York" in the name

date:10/20/11

items that appeared on 10/20/11

date:[10/1/11 TO 10/20/11]

items appearing between 10/1/11 and 10/20/11

author:"Bill Gates"

items by author "Bill Gates"

title:unsubstantiated

items with "unsubstantiated" in the title

body:"severely polluted"

items with "severely polluted" in the body

link:http://www.marco.org/2011/04/16/rumored-apple-hdtv

items linking to http://www.marco.org/2011/04/16/rumored-apple-hdtv

Note: all operators that take urls will accept simple domain names, which match any item at that domain, or complete item urls.

Lenovo buys mobile patents from Unwired Planet for $100M
— Lenovo on Thursday continued ramping up its mobile arsenal. — The Chinese computing giant, which in January agreed to buy Motorola for $2.9 billion, now has reached a deal to purchase 21 patent families owned by Unwired Planet for $100 million in cash.

Tim Berners-Lee: 25 years on, the Web still needs work (Q&A)
— Twenty-five years ago, on March 12, 1989, Tim Berners-Lee proposed “a universal linked information system” to help itinerant academics from across the globe run a complicated particle accelerator. — Boy, did the World Wide Web ever exceed those initial expectations.

Beats Music opens up, making its API public
— Streaming-music service Beats Music is opening up some of its programming to outsiders, with the goal of proliferating the new $120-a-year subscription player in the broader online universe. — “If you're willing to pay $100 a year for music …

Scoop: Spotify hires Beats Music former head of product
— Fredric Vinna, part of Beats Music's early team of creators, recently left the streaming music service and will soon begin work at its main rival, Spotify. — The rivalry between Spotify and Beats Music, two key streaming music services, is deepening.